Method of turning lasts.



.No. 870,484. PATENTED NOV. 5, 1907. w. E. TRUPANT.

METHOD OF TURNING LASTS.

APPLICATION FILED 0011.15. 1904.

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M I fiwwww au swi/bvw/am myd' No. 870,484. PATENTED NOV. 5, 1907.

W. E. TRUFANT.

METHOD OF TURNING LASTS. APPLIOATION FILED 001.15. 1904.

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W. B. TRUFANT. METHOD OF TURNING LASTS.

APPLICATION FILED 00T.15. 1904.

PATENTED NOV. 5, 1907.

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UNITED STATES PATENT OFFICE.

WALTER E. TRUFANT, OF WHITMAN, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO THE PREMIER LAST COMPANY, OF GREAT RIVER, LONG ISLAND, NEW YORK, A GOR- PORATION OF NEW YORK.

METHOD OF TURNING LASTS.

Specification of Letters Patent.

Patented Nov. 5, 1907.

To all whom it may concern:

Be it known that I, WALTER E. TRUFANT, of Whitman, in the county of Plymouth, and in the State of Massachusetts, have invented a certain new and useful Improvement in Method of Turning Lasts, and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation of a block adapted for turning by my method: Fig. 2 is a top plan view of the same: Figs. 3 and 4 are perspective views of the parts of the block referred to in Fig. 1, Fig. 5 is a view of a partially completed last, turned in accordance with my method: and Fig. 6 is a view of a model last adapted for use in turning in' accordance with my method. Figs. 7 and 8 are side elevations of the model holding clamp, with the model shown therein in difierent positions; Fig. 9 a perspective view of the two blocks to be turn ed, coupled together.

The object of my invention, has been to provide a method of turning lasts, which shall have the advantages of making possible the production of divided lasts, which shall have parts that, while properly fitting the hinge, will have their foot shape contours in true relation to each other, and of making possible the production of lasts with interchangeable parts, and to such ends my inventionconsists in the method of turning lasts hereinafter specified.

In illustrating the principle of my invention, I shall describe it. as employed in the manufacture of the last which is the subject of Letters Patent No. 633,741, granted September 26th, 1899 to me.

In carrying my invention into practice, I provide blocks]? and Q, whose abutting surfaces p and q, re- 35 spectively, are finished like the abutting surfaces of the fore-part and heel-part a and b, respectively, of the last of the said patent. Slots 6 and e are, respectively, formed in the blocks P and Q, which slots correspond to the slots e, e of the said last. A hinge T, consisting of links 1 and 72, corresponding to the links I and h of the said last is secured in the said recesses by pins 1'- and j, corresponding to the pins 1' and j of the said last. A model last, such as shown in Fig. 1 of the said patent, and in Fig. 6 of the annexed drawings is pro- 45 vided when it is desired to reproduce, by turning, a

new last from the blocks before described.

If it is not desired to make the last parts interchangeable, the blocks P and Q are fastened together by closing the hinge in the manner shown in Fig. 1 of the said patent, and the model and block are mounted between the centers of an ordinary last turning lathe, which lathe may be, for instance, such a lathe as is described in the patent to .T. E. Kimball, No. 546,160, Sept. 10, 1895. Y

It will be found convenient to place a block U over the projection Z of the hinge of the model, so as to prevent the model wheel from coming in contact with the said projection, and unlocking the hinge, and also to prevent the cutter from striking the similar projection on the hinge of the block. The model and block having been mounted on the centers of the lathe are then turned in the ordinary way, and if the model is properly constructed, it will be found that the foot-shape contours of the fore-part and heel-parts are flush with each other in the new last, and that the abutting surfaces and hinge all have the proper relation to each other.

If it is desired to make the last parts of different blocks or of any block with the model interchangeable, centers can be laid off at the toe and heel of the model, and corresponding centers laid off in the block in any desired manner, which will secure the turning of different blocks on an axis of rotation bearing the same relation in each block to the axis of rotation in the model. A convenient way of accomplishing such result is to make impressions in the-toe and heel of the model which are adapted to receive the toe and heel dogs of the lathe, or, more advantageously, which are adapted to receive an ordinary dead center and a dog or chuck having a pin or projection in line with its axis of revolution such, as is commonly used in ordinary wood turn. The model is then as illustrated in Fig. 7 mounted by means of the aforesaid indentations or impressions for the dogs so that it can be swiveled on a clamp U setting on a surface plate or table. The model is then adjusted so that a line through the center points, in each end of the last, is parallel with the surface plate, and positioned so that the jog or shoulder in the abutting surfaces of the last is also parallel with the surface plate. By means of a surface gage a line ww is then drawn around the model passing through the center points before mentioned. The connected blocks, which are to be turned, are then set up so that the angle of the secant face to the surface plate will be the same as was the angle of the secant face of the model to the surface plate, and so that the jog or shoulder will be at exactly the same height from the surface plate as was the jog in the model. A line w'w is then drawn around the composite block formed by the two individual blocks at the same height as the line on the model. The model is then as illustrated in Fig. 8 clamped so that the face of the jog or shoulder is exactly vertical to the surface plate, and the line passing through the indentations in the toe and heel is parallel with the surface plate. A second line .XX'is then 1 Having thus described my invention, what I claim drawn around the model with a surfacegage, precisely as the first line was drawn. The block is then set up in exactly the same way as the just described position of the model, so that its jog is vertical to the surface plate and its hinge at the known distance above the surface plate. A line is then drawn about the block at the same height as was the second line on the model. The proper center for the toe will as indicated in Fig. 9 be indicated by the intersection of the two lines on the larger of the two individual blocks andthe center for the heel will be indicated by the intersection of the two lines on the smaller block of the heel. The block is then centered in the lathe on its points, and turned in the usual manner of turning a solid block, and the result will be that, if the last turned is-of the same size and width asthe model, the fore-part of the one will properly fit the heel-part of the other, or of any other block similarly centered and turned or, in other words, be interchangeable.

I It is obvious that various changes can be made in the above described process, which shall be within the scope of my invention.

1. The method of turning last parts, which consists in first finishingan abutting or secant surface on the block, securing a hinge to the block, supporting Lhehinge end of the block in the lathe by means of said hinge, and then turning the foot shape contour. 3O

2. The method of turning lasts or last parts, which consists in finishing the abutting or secant ends of fore-part and heel-part blocks, connecting the said blocks by a' hinge or other connecting device to be used in the finished last, and then turning the said blocks in the ordinary manner.

The method of turning lasts or lasts parts, which consists in finishing the abutting or secant ends of forepart and heel-part blocks, providing said ends with suitable surfaces for receiving a hinge or other connecting device to be used in the finished last, connectingthe said blocks'by a suitable device for holding them in the same relation as they would bear. if connected by said hinge, and then turning the said blocks in the ordinary manner.

In testimony that I claim the foregoing I have hereunto set my hand.

WALTER E. TRUFANT.

Witnesses RALPH C. POWELL, FREDERICK L. EMERY. 

